Alter hardware requirements

extras.md

@@ -1,3 +1,3 @@
 You'll also need:
 
-- A cardboard box
+- A cardboard box (optional)

hardware.yml

@@ -2,5 +2,9 @@
   img: camera
 - name: Raspberry Pi touch screen
   img: breadboard
-- name: 2 x buttons
+- name: 2 x large buttons
+  img: big-dome-push-button
+- name: 2 x tactile push buttons (if you are not using large buttons)
   img: tactile-push-button
+- name: Breadboard (only required if using small buttons)
+  img: breadboard

worksheet.md

@@ -7,7 +7,7 @@ You can create your All Seeing Pi using any housing you like. Our first iteratio
 
   ![All Seeing Pi in a cardboard box](images/asp-cardboard.png)
 
-If you don't have fancy buttons or a touch screen, that's OK too - you can still make the All Seeing Pi! Here is a picture of the setup we used when creating this resource, the only extra hardware requirements are two tactile push buttons, four jumper leads and a PiCamera - you can use your usual monitor, keyboard, and mouse.
+If you don't have fancy buttons or a touch screen, that's OK too - you can still make the All Seeing Pi! Here is a picture of the setup we used when creating this resource, the only extra hardware requirements are two tactile push buttons, four jumper leads, a breadboard and a PiCamera - you can use your usual monitor, keyboard, and mouse.
 
   ![All Seeing Pi test setup](images/test-setup.png)